<template>
  <div class="app-container">
    <!--表单-->
    <el-form :inline="true" class="demo-form-inline">
      <el-form-item>
        <el-select v-model="searchObj.type" clearable placeholder="请选择">
          <el-option label="学员登录数统计" value="login_num" />
          <el-option label="学员注册数统计" value="register_num" />
          <el-option label="课程播放数统计" value="video_view_num" />
          <el-option label="每日课程数统计" value="course_num" />
        </el-select>
      </el-form-item>
      <el-form-item>
        <el-date-picker v-model="searchObj.begin" type="date" placeholder="选择开始日期" value-format="yyyy-MM-dd" />
      </el-form-item>
      <el-form-item>
        <el-date-picker v-model="searchObj.end" type="date" placeholder="选择截止日期" value-format="yyyy-MM-dd" />
      </el-form-item>
      <el-button :disabled="btnDisabled" type="primary" icon="el-icon-search" @click="showChart()">查询</el-button>
    </el-form>
    <div class="chart-container">
      <div id="chart" class="chart" style="height:500px;width:100%" />
    </div>
  </div>
</template>
<script>
import echarts from 'echarts'
import sta from '@/api/sta'
export default {
  data() {
    return {
      searchObj: {},
      btnDisabled: false,
      xData:[],
      yData:[]
    }
  },
  methods: {
    showChart(){
      sta.getStaData(this.searchObj).then(res=>{
        this.xData = res.data.date_calculatedList
        this.yData = res.data.numDataList
        this.setChart()
      })
    },
    setChart() {
      // 基于准备好的dom，初始化echarts实例
      this.chart = echarts.init(document.getElementById('chart'))
      // console.log(this.chart)
      // 指定图表的配置项和数据
      var option = {
        // x轴是类目轴（离散数据）,必须通过data设置类目数据
        xAxis: {
          type: 'category',
          data: this.xData
        },
        // y轴是数据轴（连续数据）
        yAxis: {
          type: 'value'
        },
        // 系列列表。每个系列通过 type 决定自己的图表类型
        series: [
          {
            // 系列中的数据内容数组
            data: this.yData,
            // 折线图
            type: 'line'
          }
        ]
      }
      this.chart.setOption(option)
    }
  }
}
</script>
